Garrity at Motorsport is developing a longer stroke to get to 3.4. I'll give an update when he is willing to share.

George

Sweet. I plan on doing a 968, with as much displacement as possible, eventually. Maybe this year, sometime after I recuperate from the 951. The 951 will stay 3.0. After paint/wheels, Ill be done sinking large chunks of cash, into it. Youll definitely have to let us know George.

AN interesting note for 8v 3 liter builders - the 16v 3.0 engines have a harmonic damper built into the a/c alt pully and the 8v engine do not. The harmonic damper is a good idea to keep for the larger crank....

Chris, correction on that. Only the S2 has this harmonic damper. 968's get DMF, which provides the damper features. Also, 968 turbo S from the factory had this vibration damper so it was used on 8 valve heads as well.
Regards.
Raj

In PET the pulley for the 944 S2 (M44/41) is labeled "vibration damper" whereas the one for the 968 (M44/43 M44/44) is labeled "pulley". Parts numbers are different
Might the 968 pulley actually have no impact as a harmonic damper given the presence of the dual mass flywheel ?

You are 100% correct. 968's have just a standard light weight pulley unlike the S2, which has this harmonic damper. 968's get DMF.
Raj

Ugh, im so ancy I cant wait for my car to be done!!!!!!!!!!!!!!! I was told yesterday another week minimum. The builder is takin his sweet time to tune, thats ok tho, quality takes time. They want to do the break in themselves too, thats mostly the hold up at this point. I feel like a kid counting the days to xmas. Did I mention Im ancy, and cant wait? LOL

I've been trying to keep the list up to date, but if you see any errors, let me know.

In the meantime, I have a question: I have seem the S2/968 crank stroke referred to as 87.8mm, as 88mm and as 88.6. All the Porsche reference materials I've seen, such as the 968 factory manual, list it as an 88mm stroke. So, where are people getting these other specs? Even clarks-garage lists it as 87.8. Anyone know why?

Well, 1mm difference in stoke make about 34cc difference in overall displacement on a 104mm bore, so these reported stroke differences would make even less impact on total cc's. I've been poking around and cannot find anything but 88 in Porsche's literature, but assume there is more to the story since clarks-garage shows 87.8 (and clark is usually a good fact checker) and a number of people have said 88.6 in this thread. If anything, I was just curious if I calculated my compression ratio correctly, since I used 88mm stroke without actually checking.

Perhaps it's just been that people have started rounding up the 87.8 to 88? Not sure on the 88.6 though. Perhaps that's the one I was informed about. Interesting that this hasn't surfaced before though?